Propeller.



J. KOPCSAY.

PROPELLR. APPLICATION FILED FEB..25. i918.

.Patented Apr. 15,1919.

ywill produce a high` torque l UN En strirrnsPA'r f l v. Josnrir Korcs'AY, or sourir Bann, nanterre# i' i rnornnrnn.

Specification tif-Letters Patent. Patented Apr. 15, 1919.;

Application ined February 25, 191s'. serial No. 219,055. y Y

4which the following is a specification.

The invention relates to an improvement in propellers, .and is adapted `for various uses, such as driving machinery, in which case the propeller is driven by wind or water currents, and as a propeller for air or water craft, in which the propeller is 4power driven to act against the resistance of the air or water and thus 'drive the craft forward, as is well understood in the art.

The object of the invention resides in the provision of a propeller which, primarily, ratio under the influence of a' given wind or water pressure; and, secondarily, a propeller having blades of a form and angularity with respect to their common axis which results in most easily translating the wind or water pressure into rotary power.

' A further obg'ect of the invention resides f* as a .power producing in the provision ofa propeller of the vcharacter above set forth, which is of few parts and simple of structure, and hence easily vand cheaply manufactured.

d The invention in the preferred form of de tails will be described in the following specication, reference being had particularly to the accompanying drawings, in which:

Figure 1 is a side elevation of the propeller shown mounted on a shaft.

Fig. 2 is an end view .thereof viewed in the directiony of the work surfaces of the lblades.

Fig. 3 is a perspective view thereof.

Referring now more particularly to the drawings, the reference numeral 5 designates a shaftupon which the propeller 6 is mounted, it being immaterial whether the shaft be driven by the propeller or the propeller by the shaft, according to the use to which the vsame is to be applied.

Primarily the propeller is adaptedfor use element under the 1niuence of wind or water pressure, and conof two blades 7 and'S, relatively inclined and oppositely disposed, forming substantially a right-angle when viewed edgewise of the blades, as shown in Fig. l, with the apex of the angle directed forwardly. The forward edges of the i blades,`-` as 9 andv 10, are in alinement, and

theblades extend at an angle and on opposite'sides lof a right line drawn transverse their common axis, the angle of inclination of .each blade with reference to the common axis being substantially forty-five degrees. The outer marginal edges 11 and 12 of the blades arecurved so that, when viewed in plan, they would form arcs of the same circle, as will appear by considering be a plan view. In fact, however, due to the angle of inclination of the blades, the same are elongated and do not form a true quad` rant of a circle, because 4due to suchinclination the radial length of the inclined sides 13 would be considerably greater than the radial length of the edges 9 and. 10, which are disposed at right angles with respect to the common axis of the blades.

In practice I prefer to form the entire propeller, with the exception of the blade faces, of a single casting. Thus I prefer to forni the frame triangular in outline, the outer and inner hubs 14 and 15 being connected by radial alined arms 16 extending from the hub 15, and inclined bars 17 extending from the hub llito the outer ends of the arms 16, said arms and bars being integrally formed with the hubs and with each Qther, the frame as a wholebeing strengthened by webs or ribs 18 extending lengthwise of the arms and bars. Extending outwardly from the outer hub 14 are bars 19, the outer ends of which are connected with the outer ends of the bars 17 f by curved bars 20, thus forming an open frame to which the plane surface blades 7 and 8, which may be of sheet metal, fabric, or other suitable material, are secured in any suitable manner. As shown in Fig. 2, the blades of sheet metal may be fixed to the frame members by means of rivets 21, passed throughthe margin of the blades and the frame members.

By' constructing the propeller with a skeleton frame and with spaced hubs, I obtain lightness of weight. The triangular formation of the frame also gives great strength, and by. disposing the blades at substantially forty-five degrees of inclination to their common axis of rotation, and by the use of plane blades each presenting a large area of resist ance-to the propelling force, I have provided a very simple and easy running propeller translating a high percentage of the propelling force into rotary power.

Fig. 2 to ics `What is claimed is:

l.l A propeller comprisin mg transverse the axis ofthe frame and in opposing relation, the forward edges of the blades being. substantially alined and the facels ther-eo forming an approximate right ang e. v l Y r2. A propeller comprising a triangular frame having. its axis of rotation perpendicular with respect to its base and coincident with the apex thereof, and blades carried by the frame extending laterally thereof in opposing relation and inclined from the a frame, and' plane inclined blades carrie by and extendapex to the base of the frame, at substantlally right angles with relation to each other.

3. A propeller comprising an open triangular frame having spaced hubs alined perpendicular with respect to the base and coincident with the apex thereof, and blades :carried by and extending transverse the frame in opposing relation and inclined at substantially right angles with relation to each other.

In testimony WliereofI affix my signature. l

JOSEPH KOPCSAY. 

